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blob 9f493f1d65e95d8eda62ead629679f58ae50027d 2016 bytes (raw)
name: guix/build/hg.scm 	 # note: path name is non-authoritative(*)

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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2018 Mark H Weaver <mhw@netris.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (guix build hg)
  #:use-module (guix build utils)
  #:export (hg-fetch))

;;; Commentary:
;;;
;;; This is the build-side support code of (guix hg-download).  It allows a
;;; Mercurial repository to be cloned and checked out at a specific changeset
;;; identifier.
;;;
;;; Code:

(define* (hg-fetch url changeset directory
                   #:key (hg-command "hg"))
  "Fetch CHANGESET from URL into DIRECTORY.  CHANGESET must be a valid
Mercurial changeset identifier.  Return #t on success, #f otherwise."

  (invoke hg-command
          "clone" url
          "--rev" changeset
          ;; Disable TLS certificate verification.  The hash of
          ;; the checkout is known in advance anyway.
          "--insecure"
          directory)

  ;; The contents of '.hg' vary as a function of the current
  ;; status of the Mercurial repo.  Since we want a fixed
  ;; output, this directory needs to be taken out.
  ;; Since the '.hg' file is also in sub-modules, we have to
  ;; search for it in all sub-directories.
  (for-each delete-file-recursively
            (find-files directory "^\\.hg$" #:directories? #t))

  #t)

;;; hg.scm ends here

debug log:

solving 9f493f1d6 ...
found 9f493f1d6 in https://yhetil.org/guix-devel/20181202115355.51c943b5@alma-ubu/
found ea51eb670 in https://git.savannah.gnu.org/cgit/guix.git
preparing index
index prepared:
100644 ea51eb670b32915de40355770d13e0fc433aef3b	guix/build/hg.scm

applying [1/1] https://yhetil.org/guix-devel/20181202115355.51c943b5@alma-ubu/
diff --git a/guix/build/hg.scm b/guix/build/hg.scm
index ea51eb670..9f493f1d6 100644

Checking patch guix/build/hg.scm...
Applied patch guix/build/hg.scm cleanly.

index at:
100644 9f493f1d65e95d8eda62ead629679f58ae50027d	guix/build/hg.scm

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    Blobs themselves have no identifier aside from the hash of its contents.^

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